Column

Donors

862939

Females

49%

Males

51%

prediabetic

16.1%

diabetic

4.6%

till date

Nov 21,'25

Column

Donors

Donor density by zipcode using combined donors counts from Mar’25 and Aug’25 are mapped.

Diabetics

Percentage of diabetic, prediabetic, and normoglycemic donors by age-group are shown in this barplot.
For every age-group, a higher percentage of black and hispanic donors are diabetic than other races.

Gender

Boxplots for A1c% by age-group are compared between female and male donors.
Median values are labeled for each.
For each age-group, males have higher median value than females.

Race

Boxplots for A1c% by age-group are compared between asian, black, hispanic, and white donors.
Median values are labeled for each.
For each age-group, black donors have higher median value than others.

US estimates

US weighted estimates for diabetes and prediabetes, determined from NHANES 2021-2023 A1c lab data, is compared with the subset of Red Cross donor population.
For any age group, the percentage of diabetics or prediabetics is higher in the overall US estimated prevalence.

Zipcodes

Circles represent individual zipcodes
Zipcodes are colored by their percentage of diabetic donors.
Clicking on a circle shows the related information for the specific zipcode
Use the mouse scroll button to zoom in or out Use “Donors/zipcode” filter to select zipcodes with a minimum/maximum donor count Use “Diabetic%” filter to select zipcodes with specific cut-off percentages of diabetic donors

Summary by glycemia

Donor Characteristics

Characteristic

normal
N = 683,806

prediabetes
N = 139,286

diabetes
N = 39,847

gender, n (%)

F

351,873 (83%)

58,144 (14%)

12,745 (3.0%)

M

331,933 (75%)

81,142 (18%)

27,102 (6.2%)

race/ethnicity, n (%)

Hispanic Origin

36,533 (82%)

6,255 (14%)

1,961 (4.4%)

NH Asian/other

44,376 (78%)

9,860 (17%)

2,665 (4.7%)

NH Black

21,964 (67%)

8,490 (26%)

2,445 (7.4%)

NH White

580,933 (80%)

114,681 (16%)

32,776 (4.5%)

age, Median (Q1, Q3)

49 (33, 63)

64 (55, 70)

64 (55, 71)

age group, n (%)

-29

140,301 (97%)

3,558 (2.5%)

764 (0.5%)

30-54

265,317 (87%)

30,818 (10%)

8,389 (2.8%)

55-

278,188 (67%)

104,910 (25%)

30,694 (7.4%)

median household income, Median (Q1, Q3)

58,376 (46,110, 76,021)

56,313 (45,415, 72,737)

54,048 (44,012, 69,214)

By test months

Donor characteristics by test months

Donor characteristics

Mar'25, N=3761451

Aug'25, N=3007151

Nov'25, N=1860791

A1c%

5.30 (5.10, 5.50)

5.40 (5.20, 5.60)

5.30 (5.10, 5.60)

Glycemia

normal

307,522 (82%)

227,016 (75%)

149,268 (80%)

prediabetes

51,731 (14%)

58,291 (19%)

29,264 (16%)

diabetes

16,892 (4.5%)

15,408 (5.1%)

7,547 (4.1%)

gender

F

182,688 (49%)

146,873 (49%)

93,201 (50%)

M

193,457 (51%)

153,842 (51%)

92,878 (50%)

Race

Hispanic Origin

18,888 (5.0%)

14,320 (4.8%)

11,541 (6.2%)

NH Asian/other

22,531 (6.0%)

20,094 (6.7%)

14,276 (7.7%)

NH Black

13,734 (3.7%)

10,428 (3.5%)

8,737 (4.7%)

NH White

320,992 (85%)

255,873 (85%)

151,525 (81%)

Age

54 (37, 66)

55 (41, 66)

48 (30, 63)

Age Group

-29

65,258 (17%)

33,573 (11%)

45,792 (25%)

30-54

126,467 (34%)

112,203 (37%)

65,854 (35%)

55-

184,420 (49%)

154,939 (52%)

74,433 (40%)

First-Time Donor

49,867 (13%)

35,125 (12%)

39,509 (21%)

BMI group

70,856 (19%)

50,393 (17%)

21,611 (12%)

morbid obestiy

35,306 (9.4%)

30,470 (10%)

18,607 (10.0%)

normal

92,564 (25%)

70,165 (23%)

52,635 (28%)

obese

61,747 (16%)

52,496 (17%)

31,895 (17%)

overweight

114,913 (31%)

96,772 (32%)

60,846 (33%)

underweight

758 (0.2%)

416 (0.1%)

483 (0.3%)

BMI

27.4 (24.2, 31.2)

27.5 (24.4, 31.5)

27.2 (24.0, 31.0)

1Median (Q1, Q3); n (%)

By month/glycemia

Characteristic
Mar’25
Aug’25
Nov’25
normal
N = 307,522
1
prediabetes
N = 51,731
1
diabetes
N = 16,892
1
normal
N = 227,016
1
prediabetes
N = 58,291
1
diabetes
N = 15,408
1
normal
N = 149,268
1
prediabetes
N = 29,264
1
diabetes
N = 7,547
1
A1c% 5.20 (5.00, 5.40) 5.80 (5.70, 6.00) 7.10 (6.70, 7.90) 5.30 (5.10, 5.40) 5.80 (5.70, 6.00) 7.10 (6.70, 7.80) 5.20 (5.10, 5.40) 5.80 (5.70, 6.00) 7.10 (6.70, 7.90)
Gender








    F 156,262 (86%) 21,154 (12%) 5,272 (2.9%) 117,304 (80%) 24,524 (17%) 5,045 (3.4%) 78,307 (84%) 12,466 (13%) 2,428 (2.6%)
    M 151,260 (78%) 30,577 (16%) 11,620 (6.0%) 109,712 (71%) 33,767 (22%) 10,363 (6.7%) 70,961 (76%) 16,798 (18%) 5,119 (5.5%)
Race








    Hispanic Origin 15,797 (84%) 2,311 (12%) 780 (4.1%) 11,087 (77%) 2,451 (17%) 782 (5.5%) 9,649 (84%) 1,493 (13%) 399 (3.5%)
    NH Asian/other 18,131 (80%) 3,415 (15%) 985 (4.4%) 14,837 (74%) 4,149 (21%) 1,108 (5.5%) 11,408 (80%) 2,296 (16%) 572 (4.0%)
    NH Black 9,597 (70%) 3,159 (23%) 978 (7.1%) 6,019 (58%) 3,422 (33%) 987 (9.5%) 6,348 (73%) 1,909 (22%) 480 (5.5%)
    NH White 263,997 (82%) 42,846 (13%) 14,149 (4.4%) 195,073 (76%) 48,269 (19%) 12,531 (4.9%) 121,863 (80%) 23,566 (16%) 6,096 (4.0%)
Age 50 (34, 64) 64 (56, 71) 64 (56, 71) 51 (37, 64) 64 (55, 70) 64 (56, 71) 44 (25, 59) 62 (52, 69) 63 (54, 70)
Age Group








    -29 63,844 (98%) 1,071 (1.6%) 343 (0.5%) 32,204 (96%) 1,162 (3.5%) 207 (0.6%) 44,253 (97%) 1,325 (2.9%) 214 (0.5%)
    30-54 112,880 (89%) 10,268 (8.1%) 3,319 (2.6%) 95,901 (85%) 13,035 (12%) 3,267 (2.9%) 56,536 (86%) 7,515 (11%) 1,803 (2.7%)
    55- 130,798 (71%) 40,392 (22%) 13,230 (7.2%) 98,911 (64%) 44,094 (28%) 11,934 (7.7%) 48,479 (65%) 20,424 (27%) 5,530 (7.4%)
First-Time Donor 45,761 (92%) 2,992 (6.0%) 1,114 (2.2%) 29,319 (83%) 4,485 (13%) 1,321 (3.8%) 35,765 (91%) 2,932 (7.4%) 812 (2.1%)
BMI group








     55,579 (78%) 11,258 (16%) 4,019 (5.7%) 36,582 (73%) 10,683 (21%) 3,128 (6.2%) 16,505 (76%) 3,912 (18%) 1,194 (5.5%)
    morbid obestiy 23,597 (67%) 8,291 (23%) 3,418 (9.7%) 18,119 (59%) 9,104 (30%) 3,247 (11%) 11,977 (64%) 4,884 (26%) 1,746 (9.4%)
    normal 85,955 (93%) 5,483 (5.9%) 1,126 (1.2%) 61,514 (88%) 7,507 (11%) 1,144 (1.6%) 48,041 (91%) 3,966 (7.5%) 628 (1.2%)
    obese 45,864 (74%) 11,665 (19%) 4,218 (6.8%) 35,507 (68%) 13,093 (25%) 3,896 (7.4%) 22,991 (72%) 6,970 (22%) 1,934 (6.1%)
    overweight 95,803 (83%) 15,006 (13%) 4,104 (3.6%) 74,913 (77%) 17,870 (18%) 3,989 (4.1%) 49,288 (81%) 9,515 (16%) 2,043 (3.4%)
    underweight 723 (95%) 28 (3.7%) 7 (0.9%) 379 (91%) 33 (7.9%) 4 (1.0%) 464 (96%) 17 (3.5%) 2 (0.4%)
BMI 26.6 (23.7, 30.4) 29.9 (26.6, 33.9) 31.2 (27.8, 35.3) 27.0 (24.0, 30.5) 29.5 (26.4, 33.5) 31.0 (27.6, 35.3) 26.6 (23.6, 30.2) 29.5 (26.4, 33.5) 31.0 (27.8, 35.4)
1 Median (Q1, Q3); n (%)